Recently got a retail Note 5 in my country (Vietnam). It was made in Vietnam and recently when I checked the Rear cam FW it showed CW73, which means it uses a Samsung ISOCELL sensor.
The S6 I used months ago was made in Korea and uses a Sony sensor (IMX240). It gave me great pictures. I no longer have the S6, but so far I think the Note 5's camera is very similar to the S6. The characteristic of the images are the same (great contrast and colors, images are lighted well in dark situations). However when I chose to focus on the same subject using the Note 4 and Note 5 (my daily device is the Note 4) the image on the Note 4 is lighted more balanced, while the Note 5 is somewhat overexposed (just a little).
So what sensor is inside your Note 5? Is there any Note 5 with Sony sensor? Does it make any differences? You can check by typing *#34971539# in the stock dialer.